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DERIVATIVE INSTRUMENTS (Tables)
12 Months Ended
Dec. 31, 2011
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Text Block
   As of December 31, 2011
   Derivatives Not         
   Designated as Hedges         
   Commodity            
   and Capacity Commodity        Net Amount
   Contracts Supply and        Recorded as
   Required by Price Risk Hedging Collateral  Derivative
(Millions of Dollars) Regulation  Management Instruments and Netting (1) Asset/(Liability) (2)
Current Derivative Assets:               
Level 2:               
 Other $ - $ - $ 2.3 $ - $ 2.3
Level 3:               
 CL&P   17.5   0.4   -   (11.6)   6.3
 Other   -   4.7   -   -   4.7
Total Current Derivative Assets $ 17.5 $ 5.1 $ 2.3 $ (11.6) $ 13.3
                 
Long-Term Derivative Assets:               
Level 3:                
 CL&P $ 174.2 $ - $ - $ (80.4) $ 93.8
 Other   -   4.6   -   -   4.6
Total Long-Term Derivative Assets $ 174.2 $ 4.6 $ - $ (80.4) $ 98.4
                 
Current Derivative Liabilities:               
Level 3:               
 CL&P $ (95.9) $ - $ - $ - $ (95.9)
 WMECO   (0.1)   -   -   -   (0.1)
 Other   -   (16.1)   -   4.5   (11.6)
Total Current Derivative Liabilities $ (96.0) $ (16.1) $ - $ 4.5 $ (107.6)
                 
Long-Term Derivative Liabilities:               
Level 3:               
 CL&P  $ (935.8) $ - $ - $ - $ (935.8)
 WMECO   (7.2)   -   -   -   (7.2)
 Other   -   (17.3)   -   0.4   (16.9)
Total Long-Term Derivative Liabilities $ (943.0) $ (17.3) $ - $ 0.4 $ (959.9)

  As of December 31, 2010
  Derivatives Not Designated         
  as Hedges         
  Commodity            
  and Capacity Commodity        Net Amount
  Contracts Supply and        Recorded as
  Required by Price Risk Hedging Collateral Derivative
(Millions of Dollars)Regulation Management Instruments and Netting (1) Asset/(Liability) (2)
Current Derivative Assets:              
Level 2:              
 Other$ - $ - $ 7.7 $ - $ 7.7
Level 3:              
 CL&P  5.8   2.1   -   -   7.9
 Other  -   1.7   -   -   1.7
Total Current Derivative Assets$ 5.8 $ 3.8 $ 7.7 $ - $ 17.3
                
Long-Term Derivative Assets:              
Level 2:              
 Other$ - $ - $ 4.1 $ - $ 4.1
Level 3:               
 CL&P  195.9   -   -   (80.0)   115.9
 Other  -   3.2   -   -   3.2
Total Long-Term Derivative Assets$ 195.9 $ 3.2 $ 4.1 $ (80.0) $ 123.2
                
Current Derivative Liabilities:              
Level 2:              
 PSNH$ - $ (12.8) $ - $ - $ (12.8)
Level 3:              
 CL&P  (54.3)   (0.2)   -   7.7   (46.8)
 Other  -   (12.4)   -   0.5   (11.9)
Total Current Derivative Liabilities$ (54.3) $ (25.4) $ - $ 8.2 $ (71.5)
                
Long-Term Derivative Liabilities:              
Level 3:              
 CL&P $ (883.1) $ - $ - $ - $ (883.1)
 Other  -   (26.8)   -   0.2   (26.6)
Total Long-Term Derivative Liabilities$ (883.1) $ (26.8) $ - $ 0.2 $ (909.7)
Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance Text Block
            
     Amount of Gain/(Loss) Recognized on Derivative Instrument
   Location of Gain or Loss For the Years Ended December 31,
(Millions of Dollars) Recognized on Derivative 2011 2010 2009
NU           
Commodity and Capacity Contracts            
 Required by Regulation Regulatory Assets/Liabilities $ (158.1) $ (74.0) $ (99.9)
Commodity Supply and Price Risk            
 Management Regulatory Assets/Liabilities   (3.9)   (21.7)   (73.2)
Commodity Supply and Price Risk  Fuel, Purchased and Net          
 Management  Interchange Power   0.5   2.7   6.2
             
CL&P           
Commodity and Capacity Contracts            
 Required by Regulation Regulatory Assets/Liabilities   (150.8)   (74.0)   (99.9)
Commodity Supply and Price Risk            
 Management Regulatory Assets/Liabilities   (2.8)   (6.2)   (7.8)
             
PSNH           
Commodity Supply and Price Risk            
 Management Regulatory Assets/Liabilities   (1.0)   (15.0)   (62.6)
             
WMECO           
Commodity and Capacity Contracts           
 Required by Regulation Regulatory Assets/Liabilities   (7.3)  -  -
Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
 For the Years Ended December 31,
 2011 2010 2009
(Millions of Dollars)Swap Hedged Debt Swap Hedged Debt Swap Hedged Debt
Changes in Fair Value$ 1.0 $ (1.0) $ 9.5 $ (9.5) $ 1.6 $ (1.6)
Interest Recorded in Net Income  -   10.5   -   10.9   -   9.1
Schedule Of Cash Flow Hedges Included In Accumulated Other Comprehensive Income Loss [Table Text Block]
 Gains/(Losses) Recognized on Gains/(Losses) Reclassified from AOCI    
 Derivative Instruments into Interest Expense   
 For the Year Ended December 31, For the Years Ended December 31,   
(Millions of Dollars)2011 2011 2010 2009   
NU$ (25.1) $ (1.3) $ (0.4) $ (0.4)   
CL&P  -   (0.7)   (0.7)   (0.7)   
PSNH  (18.2)   (0.8)   (0.2)   (0.2)   
WMECO  (6.9)   (0.1)   0.1   0.1   

  For the Year Ended December 31, 2011  
(Millions of Dollars)NU  PSNH  WMECO  
Balance as of January 1, 2011$ (4.2) $ (0.6) $ (0.1)  
 Hedged Transactions Recognized into Earnings  0.7   0.5   0.1  
 Cash Flow Hedging Transactions Entered into for the Year  (14.9)   (10.8)   (4.2)  
Net Change Associated with Hedging Transactions  (14.2)   (10.3)   (4.1)  
Total Fair Value Adjustments Included in Accumulated          
 Other Comprehensive Loss$ (18.4) $ (10.9) $ (4.2)  
            
For further information regarding cash flow hedging transactions, see Note 4, "Derivative Instruments," to the consolidated financial statements.
Schedule Of Credit Risk Contingent Features [Table Text Block]
 As of December 31, 2011
          Additional Standby
 Fair Value Subject        LOCs Required if
 to Credit Risk Cash  Standby  Downgraded Below
(Millions of Dollars)Contingent Features Collateral Posted LOCs Posted Investment Grade
NU$ (23.5) $ 4.1 $ - $ 19.9

 As of December 31, 2010
          Additional Standby
 Fair Value Subject        LOCs Required if
 to Credit Risk Cash  Standby  Downgraded Below
(Millions of Dollars)Contingent Features Collateral Posted LOCs Posted Investment Grade
NU$ (30.9) $ 0.5 $ 24.0 $ 18.5
PSNH  (12.8)   -   24.0   -
Rollforward Of Net Derivative Asset Liabilities Valued Using Unobservable Inputs
  NU
  Commodity      
  and Capacity Commodity   
  Contracts Supply and   
  Required By  Price Risk   
  Regulation Management Total Level 3
(Millions of Dollars)        
Derivatives, Net:         
Fair Value as of January 1, 2010$ (720.3) $ (40.9) $ (761.2)
Net Realized/Unrealized Gains/(Losses) Included in:         
 Net Income(1)  -   2.7   2.7
 Regulatory Assets/Liabilities  (74.0)   (7.2)   (81.2)
Settlements  (13.7)   13.2   (0.5)
Fair Value as of December 31, 2010$ (808.0) $ (32.2) $ (840.2)
Net Realized/Unrealized Gains/(Losses) Included in:         
 Net Income(1)  -   0.5   0.5
 Regulatory Assets/Liabilities  (158.1)   (2.9)   (161.0)
Settlements  26.8   11.7   38.5
Fair Value as of December 31, 2011$ (939.3) $ (22.9) $ (962.2)
          
Gains Included in Net Income Relating to        
Items Held as of End of Year:        
 2011  -   0.7   0.7
 2010  -   1.2   1.2

  CL&P WMECO
  Commodity       Commodity
  and Capacity Commodity    and Capacity
  Contracts Supply and    Contracts
  Required By  Price Risk    Required By
(Millions of Dollars)Regulation Management Total Level 3 Regulation
Derivatives, Net:            
Fair Value as of January 1, 2010$ (720.3) $ 4.5 $ (715.8) $ -
Net Realized/Unrealized Losses Included in:           
 Regulatory Assets/Liabilities  (74.0)   (6.2)   (80.2)   -
Settlements  (13.7)   3.6   (10.1)   -
Fair Value as of December 31, 2010$ (808.0) $ 1.9 $ (806.1) $ -
Net Realized/Unrealized Losses Included in:           
 Regulatory Assets/Liabilities  (150.8)   (2.8)   (153.6)   (7.3)
Settlements  26.8   1.3   28.1   -
Fair Value as of December 31, 2011$ (932.0) $ 0.4 $ (931.6) $ (7.3)